president obama and mitt romney are back on the campaign trail, but still debating taxes. >> susie: i'm susie gharib. the feds launch one of the largest crackdowns on medicare fraud. $430 million in scams leads to arrests from coast to coast. >> tom: and we'll introduce you to a company hoping to become the mcdonald's for healthy eaters. >> susie: that and more tonight on nbr! >> tom: it was right back to the campaign trail today for president obama and mitt romney. the president went on the attack after what's been perceived as a lackluster debate performance. and the president accused governor romney of not telling americans the truth about what president obama calls romney's $5 trillion tax plan. darren gersh, tonight, looks at what the real impact of the romney tax plan could be on the american economy. >> reporter: here's where the president gets that $5 trillion number he used again today. governor romney's plan to cut tax rates by 20% would add up to about $5 trillion over ten years, assuming no other changes. but governor romney is planning to make other changes by eliminating t